Spiral stairway.



PATENTED JAN. 1, 1907.

I G. HOLDEN. SPIRAL STAIRWAY.

APPLICATION FILED MAY 7, 1906..

2 SHEETS-SHEET l.

n tmtar WITNESSES 2 SHEETS-SHEET 2.

[NI/ENTOR Altorfle y PATENTEDJAN. 1, 1907. G. HOLDEN. v SPIRAL STAIRWAY. A PPLIUATION FILED MAY 7, 1906.

PVlT/VESSES:

UNITED sTAr s PATENT oEEm-E.

. GEORGE HOLDEN, or MERoHANTVILLE, NE\\--JERSI 1Y, assreron TO MERRITT AND COMPANY, A conronarron or PENNSYLVANIA.

SFlRAL STAIHWAY.

Specification of Letters Patent.

Patented Jan; 1, 1907.

Application filed May '7, 1906. Serial No. 315,626.

1'0 alt whom it may concern: v

Be it known that I, GEORGE HOLDEN, of, Merchantville, county of Camden, and State of New Jersey, have invented an Improvement in Spiral Stairways, of which the following is a specification. I

It is one of the objects of-my invention to provide a unit stair structure of simple and convenient form, which maybe combined stepssuppor-ted wholly by the central post.

The invention also relates to the combination or a hand-rail with such a stairway, said rail being composed of sections or units carried'by the steps and coupled together when the steps are in place to form a continuous hand-rail. These rail-sections are so supported that they may be adjusted both 1011- gitudinally and angularly to suit the requirements of erection. The units may be easily united together in the erection of the stairway and may be made to standard sizes.

1n the drawings, Figure 1 is a perspective view of a spiral stairway embodying my in- Vention. Fig. 2 is a perspective View of one of the units and the central post. Fig. 3 is a longitudinal vertical section of the handrail coupling on an enlarged scale. Fig. 4is a vertical section of the same on the line A A of Fig. 3; and Fig. 5 is a vertical transverse section, enlarged, through the outer end ortwo connected units.

The stairway is made up of a series'of units a a a and 0, connected together in spiral form and'supported at their inner ends by a central post b. The body of these units a,

which is preferably stamped fronr sheet metal, consists of a horizontal triangular tread 0, having an integral ring d at the end or apex, a, deep horizontal flange at "the front, and a narrow horizontal flange f at the back.

g is an angular endpiece hayinga flanged edge h, by which it is attached to the tread c end.

and flanges e and f of the body at the outer L is the upright post oi thestcp or unit, which carries the hand-ra1l it is a brace extending from the upper end of post i of one unit to the lower-end of the post of the next unit or step.

m represents supporting-collars secured to the central post I) to support the rings (1 of the steps.

In assembling the units and erecting the steps the rings (2 of successive units, each with its collar m below it, are 'placedon the central post b,fthe lowermoststep is adjusted about the post 1) into the proper radial position, and the collar m is secured to the post. The next unit is adjusted on the post I), so that the lower edge of its front flange e fits against the outer face of the back flange fof the lower step, and those flanges are secured together by suitable rivets or bolts, and this operation is repeated withsuccessive units until the staircase is completed.

, The same rivets or bolts which secure the flanges and j' together at the, outer ends may be used also, to fasten the end pieces g and the end of the upright i, as shown. in Fig. 5. In this case thebolts 7'1 pass through the flanges h and f of the lower unit and the flanges e and h and the upright i of the upper unit. The end pieces g and ihcupright i may'of course be secured by separate fastenings, if desired. To provide for Vertical adjustment in the connection of the units, and thus to permit Variation in the height of the steps, the bolt-holes 0 in the flanges j and e may be slotted or elongated, as shown.

So far as the invention relates to the construction and combination ol the steps it is immaterial whether any hand-rail be used, and if no handrail is necessary the uprights i and braces k may be omitted. My invention, however, embraces certain improvements in the construction of the hand-rail,

whereby each unit carries its corresponding section of the rail, and these-sections may be united to form a continuous spiral rail.

12 is a shoe pivoted, as at p, to the upper end of the upright 41 and supporting a tubular inent. Each unit carries its rail-section j,

! frame between the tread and the flange f and 6 and the complete rail is formed b v uniting T these sections together through the couplings q in the/mannerdescribed. The hinged 5 shoes p permit such radial ad ustment as may be required in the rail-sections.

front 0.

6. A unit tor a spiral stairway, consisting of stamped sheet-metal frame having a'hori- .ZOlltttl triangular tread, a narrow depending The ,horizontal angular size of the steps or units may 9 having a flange 71 secured to the outer end be. varied to suit the requirements. I have found an angle of thirty degrees for each unit to most satisfactory.

circle to be made with twelve steps.

This enables a complete 5 ll inge f at the backof said trend and a deep d )Glitllng front e and a separate end piece of said sheet-metal frame;

7. A unit for a. spiral stairway, consisting I ot a triangular metal step adapted to be sup What i claim as new, and desire to secure 3 the outer end of said step. and a hand-rail b v Letters Patent, is as follows:

'1. A spiral Si:tll\\'t1 consisting of a central post, a seribs oi in lependent metal steps having a horizontal t iangular tread and a vertical l'ront, said triangular tread tcrminat-,

ing at its inner end or apex in a supporting ring, collars adjustablv secured to said post to support said rings with the steps arranged one above the other, and means to unite the back of the triangular tread of the lower steps with the lower edge of the vertical front of the next steps above.

2. A spiralstairwav, consisting of a central post, a series of independent steps formed of stamped sheet metal having a horizontal triangular tread with a short depending flange at the back and a long depending front, 0 means to secure said steps to the central post at the innereiid or apex one above the other, and means connecting the short back llange of the lower steps with the lower edge of the depending front of the next steps above.

A spiral stairway, consisting of a central post, a s ries of independent steps formed otstamped ieet metal having a horizontal triangular tread terminating at the inner end ported at its inner end, an upright carried by section carriedbv the end of said upright.

S. A unit for a spiral stairway, consisting of a triangular metal step adapted to be supported at its inner end, an upright carried b v the outer end of said step, and a hand-rail section carried by the end of said upright with provision for angular adjustment.

9. unit for a spiral stairway, consisting of a triangular metal step adapted to be supported at its inner end, an upright carried b v the outerend of said step, a coupling-sleeve carried by said upright and a hand-rail section carried by said sleeve.

. 1t). unit for a spiral stairway, consisting of a triangular metal step adapted to be supported at its inner end, an upright carried bv the outer end of said step, and a hand-rail section carried by the end of said upright with provision for longitudinal adjustment. 11. A unit for a spiral stairway, consisting l of a triangular metal step adapted to be supor apex in an integral supporting-ring adapt- 5 5o tral post, a series of independent triangular metal steps, each supported at it inner end or apex b v said post, and arranged one above the other, means uniting the back ol each lower step with the front of the next step above. uprights carried by the outer ends of said steps, braces between the uprights oi successivt teps, and a hand-rail carried b v suiti uprighis 5. A unit for a' spiral stairway, consisting of stamped sheet-metal frame having a horizontal triangaila" tread, a narrow depending llangefat the back of said tread and a deep depending front c and a separate end piece secured to theoutcr end o said stamped ported at its inner end, an upright carried b v the outer end of said step. a shoe pivotally connected with the upper end of said upright with provision for angularadjustnient in a vertical plane, and a hand-rail section carried b v saidshoe.

12. A unittor a spiral stairway. consisting of a triangular metal st p adapted to be supported at its inner end, an upright carried by the outer end-of said step. a shoe pivotally connected with the upper end of said upright with provision for angular adjustment in a vertical plane and a coupling-sleeve carried bysaidshoe.

13. A unit for a spiral stairway, consisting ola triangular metal step adapted to be sup ported at its inner end, an upright carried b v the outer end of said step, a shoe pivotallv connected with the upper end of said. upright with provision for, angular adjustment in a. vertical plane and a coupling-sleeve carried by said shoe and adjustable longitudinally thereon. j H. A spiral stairway, composed of a series of units each consisting of a triangular step portion havingaii upright at its outer end and a rail-section carried b v said upright, a central post supporting said units one above the other at their inner ends, means connecting the back of the lower steps with the fruit rail-sections of successive. steps. section of successive-steps, and braces con- 15. A spiral stairway, composed of a series neeting the'uprights of adjacent sections.

of units each consisting of a triangular step In testiinonyof \vliieliinventionlhereunto portion having an upright at its outer end I set my hand.

of the steps above, and couplings uniting the I ofthe steps above, couplings uniting the rail- IO and a rail-section carried by-said upright, a l 7 GE(). HOLDEN. central post supporting said mars one above l Witnesses: the other at their inner ends, moans connock I H. S. BARNES,

ingthe lwglek ol the ion e1 steps with the front I W. B. PLACE. 

